Meaning of Knock

Bangla Academy Dictionary:

Definition: 1

to strike a sounding blow with the fist, knuckles, or anything hard, especially on a door, window, or the like, as in seeking admittance, calling attention, or giving a signal: to knock on the door before entering.

Definition: 2

to strike in collision; bump: He knocked into a table.

Definition: 3

to make a pounding noise: The engine of our car is knocking badly.

Definition: 4

Informal. to engage in trivial or carping criticism; find fault.

Definition: 5

Cards. to end a game, as in gin rummy, by laying down a hand in which those cards not included in sets total less than a specific amount.